Comparisons & Buyer's Guides
PHP 7 vs PHP 8 Compared
PHP 8 brought the JIT compiler, union types, attributes, match expressions, and years of optimizer work on top of PHP 7's already-big leap — while PHP 7 branches went end of life. For any maintained application the comparison is short: PHP 8 is faster, safer, and supported. The real work is the migration, not the decision.
Key points
- Treat EOL status as decisive: unsupported PHP 7 branches get no security fixes, period.
- Expect meaningful speedups moving to PHP 8 — JIT plus optimizer gains compound on real apps.
- Audit for removed features and changed behaviors before promising timelines.
- Migrate staging-first with full integration tests; deprecations hide in rarely-run code paths.
- Update extensions and opcode-cache sizing alongside the interpreter.
- Use the migration to drop dead code paths the scanner flags along the way.
- Keep the old branch warm through burn-in, then decommission fully.
- Standardize estates on supported PHP 8 minors with automated patch flow after.
Field note
Treat EOL status as the whole decision and migration effort as the project. Nobody ever regretted moving to supported PHP; plenty regret the quarters spent debating it.
Frequently asked questions
How much faster is PHP 8?
Substantially on most real workloads — JIT plus cumulative optimizer work, with the biggest wins on CPU-bound code.
Will old code break?
Some will: removed functions and behavior changes are exactly what staging passes are for.
Is the JIT always a win?
Not universally — I/O-bound web apps gain more from the general optimizer than from JIT specifically.
Should we skip to the newest minor?
Yes for new work; for migrations, target a supported minor and keep patch flow current after.
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